Waterproof paper receptacle



July 29, 192.0. E, BENg N 1,771,765

WATERPROOF PAPER RECEPTACLE Filed Jail. 24, 1925 h iilliazaEfla'uou alie/newly! Patented July 29, 1930 g UNITED STATES PATENT OFFICE WILLIAME. BENSON, or W LMINGTON, MASSACHUSETTS, essreNoR 'roixa'mx our COMPANY,or BOSTON, MASSACHUSETTS, A CORPORATION or MASSACHUSETTS WATERPROQFPAPER RECEPTACLE Application filed January 24, 1925. Serial N6. 4,485.

one and cups otherwise reasonably satisface tory for handling coldliquid are usually found utterly useless from a practical, point of viewwhen used with a hot liquid. This is duein part to the action of theheat in softening the cement or parafiin or other material used in themanufacture of the cup, and in part to the thinness of the paper wallboth in the action of the heat on the paper itself and on theconductivity of the wall which makes it diflicult to directly contactwith the wall when filled with a hot beverage.

Various attempts have been made to overcome these difliculties and toproduce a satisfactory commercial article which would be available at aprice consistent with the class of usage to which such article is put.One of the attempted solutions of this problem has been the provision ofa sheath or external reinforcement which added to'the strength of .sothe wall and provided insulation. Such cups, however, have never, as faras I have been advised, been so constructed that then seams, andparticularly their bottom seams" would withstand the high temperaturesinci- 5 dent to the problem.

Whereparafiin was used the effects of'the temperature were immediatelyto soften up theseams and cause leakage. Even the usual cemented seamsgave way after being sub- 40 jected to heat for a short time.

In accordance with my invention I provide by a simple combination ofelements, involving in part the principles of my previous in- "vention'set'forth in application Serial No. 748,516, filed November 8, 1924, bywhich I secure an additional efl'ect along the lines indicated asdesired.

Such a structure I have illustrated in the accompanying drawings a cupin accordance with my invention, to which reference being employedthroughout to indicate corresponding parts. In these drawings ig. 1 is aside elevation of a cup in accordance with my inventiomthe outer sleevebeing partly broken away to how the bottom of the cup above the bottomof the sleeve.

Fig. 2 a central vertical section through a modified form of cup.

Fig. 3 a transverse section looking into the cup, and i Fig. 4 avertical Section of a modified form.

In accordance with my invention I provide for a cup as in my previousinvention, formed wit-h a side wall member 1, of general ly flaringcharacter, having the bottom edge of its wall upturnable inwardly toform an inwardly flaring flange 1' on which to maintain a bottom. piece2 having a correspondingly downturned flange 2 surrounding a centralportion. The downturned flange of the bottom portion 2 is cemented tothe upturned flange 1' of the wall portion, the two being disposed at anangle to the vertical axis of the cup as' discussed in my priorapplication. As set forth therein this-leaves an annular channel aboutthe bottom portion of the cup surrounding the slightly raised bottomwhich is of the form of a truncated cone, the wall of which flaresinwardly at substantially the same angle of flare as the outer wall. Theseam formed between the flange 2 and the flange 1 being a glued orcemented seam is one of'the most critical features in paper cups of thistype. In accordance with my invention this seam is formed under pressureso that a very complete union of the two flanges is obtained. Thecharacter of this union under pressure makes the seam capable ofwithstanding hot liquids against which the ordinary uncompressed seamhas formed only walls of the cup while at the same time pro-- a slightbarrier. This matter of compression of this scam is therefore while notin itself the subject matter of an independent claim in the presentinvention, isa deciding factor in the insulated cup as adapted to hotliquids.

Surrounding the outer wall I provide a sleeve member 3 of paper stockpreferably of somewhat heavier .and unsized material which may be ofgreater diameter than the wall of the cup itself and'crimped verticallyto form a series of corrugations. The corrugating of such sheath orinsulating member reduces it to the diameter of the containing member ofthe cup which is then externally coated with adhesive and the sleeveslipped about it. 4

These corrugations greatly stiffen the viding insulating spaces andaffording vertical ventilation between the Walls of the container andthe sheath. Such an external sleeve whether of the corrugated type shownin Fig. 1, or the plain types shown in Fig. 2 and Fig. 4 may be extendedbeyond the bottom of the cup proper. In Fig. 2 the sleeve 3 is shownextended below the bottom of the cup as at 3 In actual practice thesleeve member 3 may be made substantially cylindrical as from a straightstrip of corrugated stock. When the sleeve 3 is slipped over the cupwall 1 in view of the comparatively slight taper of the cup and thelarge area of the corrugations, the upper portion of the corrugatedsleeve will expand to conform to the cup; This sleeve need not be ofvery heavy stock as the air spaces aflord suflicient insulation andbecause the preferable cementing of the inner folds of the corrugationto the outside of the cup wall 1 makes of the assembly a reinforcedcorrugated structure of very considerable rigidity.

Where the corrugated form of my invention is not desired, the cup may beformed as in Fig. 2 with the outer casing 3* made of a .somewhat thickerand more porous stock.

In this form I preferably, although not necessarily, carry the wall upto the rolled lip at the top of the wall 1 thereby affording additionalsupport.

In the form shown in Fig. 2, I have indicated the bottom of theenclosing sleeve 3' as extended below the bottom of the inside cup asindicated at 3 so that it will act as an insulating guard for the cupbottom.

' As illustrating a further variant of my invention I have shown in Fig.4 a form of cup in which the outer sleeve member 3 is provided with aninturned roll or bead at its 'upper edge whereby it is spaced from theinner cup Wall 1. In this. form I preferably, although not necessarily,turn back the bottom of the outer sleeve 3 as at 3 to assist in spacingthe wall 3 and to further protect and support the cup bottom 2.

In Fig. 4 I have also shown another feature which may be included in anyof the other forms of my invention although it enters into aparticularly advantageous combination in connection with the form shownin Fig. 4. In this form I form the cup bottom 2 of a transparent paperstock and msert beneath it a disc D upon which, may be printedanyadvertising matter, so that the same will be visible through thetransparent cup bottom 2. This disc D may be supported ;by the upturnedportion'3 of the-outer sleeve 3*. This same structure maybe applied tothe corrugated form shown in Fig.

1 or'may. be otherwise formed or embodied either as an independent discD or as an additional or auxiliary bottom. The essential feature is thatits printed matter be covered by the transparent inner bottom whichprotects it from the action of the liquid and protects the containedliquid from, contam1nation with the imprinted matter.

I have explained several embodiments of my invention as indicatingvaried types because of the varied demands of the trade for special cupsfor special purposes. It will be understood that while these cups areprimari ly intended for hot beverages, that they are useful for coldbeverages or even beverages at normal temperatures where the insulatingfeature is not necessary. In all these forms the strength of the cup andits rigidity and resistance to deformation by unintentional lodesire tosea tapered walled container having an upturned bottom and a taperedcorrugated insulating sleeve having integral corrugations frictionallyengaging said Walled container,

' said sleeve extending underneath said raised bottom'of said container.

3. An insulating holder for a paper cup comprising a corrugatedoutwardly flaring tapered wall having an inwardly disposed flange uponwhich the bottom of the paper cup is adapted tobear.

4. An. insulating holder for a paper cup comprising a corrugated wallhaving an inwardly disposed lip-turned flange adaptedto receive thebottom of the paper cup.

5. As a new article of manufacture, a tapered paper drinking cup adaptedto receive hot liquids and a paper sleeve having verticall disposedintegral corrugations frictiona 1y engaging said paper cup wherebinsulation is provided between the cup an the hand of the user, saidsleeve extending downwardly beyond the bottom of the paper drinking cupand providing insulation for the bottom of the cup.

In testimony whereof I afiix my signature.

WILLIAM E. BENSON.

